Reference for Eruvin 32:2

אמר אביי מדרישא רבנן סיפא נמי רבנן ומודו רבנן דכל למישרא כנגדו אי איכא מקום ארבעה חשיב ואי לא לא חשיב

Abaye replied: Since the first clause [is the view of] the Rabbis the final clause also [must be that of] the Rabbis, but<span class="x" onmousemove="('comment',' As to the objection raised.');">⁴</span> the Rabbis admit that wherever [it is a question of] permitting [to sow corn] over against [a standing part], if it is four handbreadths wide it is deemed [a partition],<span class="x" onmousemove="('comment',' Against which corn may be sown.');">⁵</span> but not otherwise.

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